samara vs achene

samara and achene both are nouns.

Word	Noun	Adjective	Verb	Adverb
samara	Yes	No	No	No
achene	Yes	No	No	No

As nouns, achene is a hypernym of samara; that is, achene is a word with a broader meaning than samara:

samara: a winged often one-seed indehiscent fruit as of the ash or elm or maple
achene: small dry indehiscent fruit with the seed distinct from the fruit wall

samara (noun)	achene (noun)
a winged often one-seed indehiscent fruit as of the ash or elm or maple	small dry indehiscent fruit with the seed distinct from the fruit wall